Valve mechanism for elevators.



T. LARSSOT,

FOR ELEVATORS.

APELIGATION FILED NOV. 8, 1909.

Patented Feb. 2, i915.

3 SHEETS-*SHEET Z car at the end of its downward t avel.

TEU TATE TH'URE LARSSON, 0F WORCESTER, MASSACHUSETTS, SSGNUR 0E'WILLIAIV E. D. STORES AND ONE-THED TO FREDERICK A.. JONES, BG.. s

YORK, N. Y.

Specification of Letters Patent.

Application filed November 8, 1009. Serial No. 526,679.

Worcester, in thel countyof lVorcester and` State of Massachusetts, haveinvented a new and useful Valve Mechanism for lElevators, of which thefollowing is a specification.

The object of this invention is to 'provide a new and improved valvemechanism for elevators, particularly hydraulic elevators of the typeknown as plunger elevators.

The special purposes of the invention are to simplify and improve thepartsso that the elevator ear can he very easily controlled and so thatthe same will be accu` rately. and correctly stopped at the ends ot' itsrun.

v To this end the invention consists ot' the parts and combinations oi'parts described in this specification. and illustrated in .theaccompanying three sheets ot' drawings in which, v

Figure l is a partial sectional. view oi' a plunger elevator withimproved mechanism applied thereto. of the lever system employed at thebottom of the well for, automatically stopping' the Fie: 3 is anelevation showing a modified torni that may be used for said levermechanism. Fig'. l is a plan view illustrating the arrangement of'sheaves 'for the controlling levers. Figs.. 5, 6 and 7 are detailedelevations of the lever system employed at the top of' the elevator wellfor stopping` the elevator car at the limits of its upward travel, andFig. S is asectional elevation on an enlarged scale of the valvemechanism showing' the main valve, pilot valve and the automaticstopping:v 'alve. A

The improvements will he best understood by a detailed description ofthe parts.

A cylinder is sunk in the ground, which cylinder isoi' a length a littlemore than the travel of the elevator. This cylinder has a stalling: lhoXon its top end fitting* and sliding! in which is a plunger C whichcarries and supports the car or platform D which is fitted to run up anddown on Iraides secured in the elevator well.

Attached to the top et the ear are collaterllalancine cables ll whichare trained over sheaves l" journaledat the top of the elevator well.

(munter-weights (l are attached to the Fig. 2 is a detailed view' left,as shown in Fie'. 5l, to allow end of the cables-ll, which countev arefitted to run up and down en cured to the side or the elevator wel,

to-andiro connection 'oipe lil con'nnunicatcs with the cylinder lVhenWater. under pressure is let 'into the to-and-ifro pipe H the plungerisforced upwardly and. the car aseends.4 lhen the to-and-ro pipe isconnected to the exhaust. the weie'ht of the car and plunger forces thewaterput of the cylinder and the ear descends. lilhen. the ll'ow in the'tonnel-fro pipe is prevented the car and plunger are held stat-ihn? v.

The -valve arrangement consists ciZ f: inain valve M. which controls theadm in of water under pressure to the c, cie" to cause the car toascend. which controls the flow ot' water from the cylinder to the einhaust to allow the ear to descend. and which stops the flow in theto-.and-'fro pii e to hold the ear stationary. The main valve is Yeightsflow to or fronrthe elevatorcylinder is stopped and the er held.tationarjvf The lmain valve is operated oy a motor piston 8o M. asshown in Fig. '8. rlhe admission of pressure on the right side et thenuto-'r `ois. ton causes the main valve to nieve Athe- .sure to tion'inte the elevator offline. the connection ot' the eiihaust with of themotor gaston causes the ain v move to the right to allow elevator i'inder to connect to th ixhau,

The admission of le pr ure or e'idiaus't se to operate the motor pistonlvl" is controlled and regulated by a pilot vaf An automa-'zie stopvalve 95 between 'the main valve anee pipeH to stop the meren'autoniaticilly the or downward valve ti is control ef 1GO on theelevator car ci -o levers and reds arrr-nf. well.

The mechanism i, i valve from the cer is arrangi mi.

.ft lever l is mounted on a iournaled in hearings on casing. Conner-.tedto ene e rope lv which is trained over a under a pulley l] and is themein 'mire tube and theredu'ced bushing is' pecking 16. Arranged,between the reduced bushing and a. shoulder on the bushing e is epecking 17. Arranged between the bushing e land' the shoulder. it on'thetube Z isv zi pecking 18. The pecking lb ceuscs the motor piston l.tolit tightly-to the mein valve casing and the packings 17 andlS ceusethemain i'eive to work tightly. The packing 16 works e brass bushingld)driven on the ri ghthend end 'of the main Valve ,casing-:ind the peclings l7 `and 18 work in e brass bushing 15G driven 4in the left-'handend of the valve casing. orts out in this'bushing 150.

- rl`he tube d is hushed with brass and runs on e piston 19 which 'issecured to-a stern120 which is threaded into csp or heed n, se@

cured to the left-hand end of the "faire cosing. Pressure `is admittedthroughopcnings' 2l into theA reduced ushing f and .throin openings 22in the me valve tube d into' the space 23 et the right or -piston 19;The piston' 19 is mede smaller than 'the motor iston M. By thiserroneernent when ressure is let on the right of `the motor piston themain valve will moi/'edito the left the` water in the space 23 being4i'orced th'roygh openings 2Q end 2l. back into the pressure. fllfhenthe -sreice etlthe right of the motor. piston M is connected to theexhaust, the pressure on the left of the motor piston M willl move Vthevsame to the right, the

Space 23 illing up through passages 2l and l The motor piston M and thepiston 19 thus form in eiiect e diitenntiel piston for giving the propermovements to the moin Valve. The peclf: ige i?" n d 1:53 are arranged sothat when the mui' is in its central position, the port 1 will not beconnected with either pressure or exiniush as packings 17 sind 18 willinclost ie ports, and so that when the mein inlif'e nn es to the leftfrom the position shown in Fig. 8, pressure will flow through the moinvulve from pipe z', and sothzit when the mein vulve is moved to theright from the po itio'n shown in Fig, fl, the exhaust pipe j wili beconnected to the passage lili'.

The vulves herein shown can be Very econoiniciilly manufactured, ns thevulve cas-- ings only hu ve to be bored t'or one diameter und thc portscan be vcry quickly and accu- ...greener I tihend end of ro pipe Hthrough the eutometicshutbf valve S 'niereimifterl 'described v 'l 1Arranged 'between the motor piston M seme, Ports 25 are cut thereinopposite the pipe W sind ports 26 opposite the to-end-fro pipe H. The'stop valve consists of a tube s which has shoulders fitting againstwhich are Valve heads c] and s' held in place by collars u and u. 'Apecking 27 is arranged between the valve heed g and the collar u and e'packing 28 .is arranged between the valve scribed may be connected toeither stem 29%29 :is the exigenciesof the location de mand. n thedrewings'the 4mechanism is Vshown es connected to the heft-hundv stem29.

Holes 30 iire arranged in the collars 290 so that the stop valve canmove freely back and' forth in the casing. Spring-'pressedcheok valves31-31 are arranged to cover openings in the tube s, the check valvesbeingsrranged to close toward thetube. When the elevator is going up,pressure is flowing from the prssure'pipe i through the main Valvethrough the pipe W to the pipe H.

When theelevaitor reaches the limits of its upward movementby theautomatic mechanisrn hereafter described, the stop' valve is moved tothe left bringing the packing 28 to. prevent iow through the ports 26and thus stopping the iow of Water between,

pipes W' und H and stopping the upward movement of the elevator. Whenthe 0pera-tor in the cer reverses the position of the main val-ve forthe downward movement,

pipe `W is connected through the main vulve to the exhoust'pipe y'. Thenthe How from the elevator cylinder will start through pipe H, throughthe right-hand openings 30; through the center of the tube s :ind outthrough the check velues 3l-3l which will` open to allow this flow tostart. As the clevutor starts on its downward movement the stop vulvewill. be niovcd to its centrul or inoperutiif'e position shown in Fig.8, by the uutoniutic mechanism hereafter de scribed, and when the our isfully on its downward uio'cment, water will How from pipe H throughports 26, ports Q5 to the pipo lV uiidlout to the exhaust pipe y'through themuiu vulve. As the cur approaches the bottom. of its downwardrun.

the. stop 'vulve will be moved to the right by the uutomutic niecliunismhereafter dcscribed. This will cuuse the pecking 27 to move to therighi; o? the ports Q5 und will check and stop this flow. lVhon theattendunt on the cui' reverses the position of the moin vulve to allowpressure signin to flow into pipe W for an 'upward movement of the ear,Water will then Il ow through the left-hand openings 30, the oen'terofthe tube i i tion after it has been sto .i )ed hv the auto-- matievalveA It also Will he seen that thisr automatic stop valve can. heeasily mannl'ae-- tured as the saine has to he bored for but onediameter.

The automatic mechanism for operating and controlling the stop valve 1sarranged as follows :will lever is mounted on a shaft journaled inhearings secured to4 the top ol. the valve casing Secured on. thev endsof this shaft are levers 33 which connect by links 34:' to one ofthevalve stems 99 of the shutoff valve; Connected tothe ends of thelever are rods 35 `'and B6 which are made in sections secured togetherby suitable couplings and which rods extend up at the side of theelevator Well. The rods 35 and 36 are connected prefe" bly at thecouplings to T-sllaped leve 7.33 and 39 arv ranged at the bottomv of theelevator Well and turning on studs er shafts secured to supports orbrackets y which are :fastened to the side et one of the ,guider-leien?the elevator ear. The downwardly extending arms of the Twlriped levers37, lll and Btl have rollers or l 1 lees 40 arranged on their ends.These emvi'm'ardly evtending arms of the T-shaped levers stand atslightly dllereliit angle so that the shoe s0 ont-,he upper le ver 39 isfarthest to the right, as shown in Arranged on. the elevajtorcar are twoguide pieces all and 1&2. the space between which forms .a earn-Wayii'ielined :from the top of the ear to the bottoni of the ear to wardthe left. The ends oi" the guide pieces 41 and 42 are curved onti'ardlvso that the inclined eamfway 'will have wir' mouths 'to engage easily.Twith the rolle e or shoes Ail). Atthe topl o'i the elevator 1 l areanged three similar `T-shaped levers which have si i ar rollers er shoes40. These uppermost levers are shown n their normal position in Fig. thecar ap preaches the upward limit oit l ren.. the inelined earn-Wayirst'eng;U the lever a the Before the earn-. leaves this shoe iten-- theshoe on leve it and continues the left-hand movement ofi the shoe orrollers l0, and as .the ear goes still farther 'up the earn-way engagesthe shoe on lever and continues the left-hand movement ot the rollersorshoes a0 until the ear reach the limits of its upward run to which themochanisrnls set, "which 1s indicatedv 1n Fig. 7;]

\ rocking motion 'is given tothe levers as the ear approaches the limitsof its upward run and. the parts can be adjusted that the storqjiingmotion oantake place in any desired movement of the elevator ear. say athirty-foot movement. y

As the car moves 'downwardly from its upward limit of travel, shovvn inFig.- 7, to aposition Where the cam-way `progressively 'sengafres therollers or shoes on the levers 4.25, Il-el and 45, the levers will berestored to normal position shown in Fig. 6.v

es the car reaches the bottom of its down- 'ward run the lower mouthofthe cam-way will first engage the roller or shoe on leverV 39 and willmove the-same to the right and then before leaving the shoe on lever 39will engage the shoe on lever 38 and will continue therigl1tl1a.nd'movement and then before leaving the shoe on lever 38 willengage the shoe on lever 37 and will still eontiene the '."ighbhandmovement of' the shoes er rollers Wl'yieh will bring the lever 32 to tlvV:nutrition shown in Fig. Il.

1e elevator car shown at itsllowest ati-eine in lijig. l. As the carstartsl up'- wardlv :troni its lowest position. the earn way Willdisengage progressively from the sho '-e on lei 37, and 39 and willrestore the opel, ing system of levers to normal position shown in Fig.i3. Thus a very simple mechania i provided lor operating the automaticstop valve.v Instead of using a single T-shaped lev'er-,heil-'cranlilevers 4:6 and i7 may be connected to the system of rods and 36. Thesebellcrank levers may he pivoted on a si'litable support 48. Thedownwardly extending ends of these levers may he connected to a l loek4f) on, which may arranger'l a shoe *l shaped that the ine'il cani-wayon the elevator -nar can age the same. This arrangement used when, it islesired to give claimed in this application tor 'patent owing to theclassification adopted in the Patent Oiiice, but the same is claimed ina companion application filed by me November. 8, 1909, Serial No.526,680.

The general design of the mechanism. herein described' has been to malteall 'the parts simple, eflicient, easy of repair and so that they can bemanufactured in large lots and used interchangeably in diierent relativepositions to meet the dierent locations encountered in adapting themechanism to clifferent plants.

The details and arrangements herein shown and described may be greatlyvaried by a skilled mechanic Without departing from the scope of myinvention as expressed in the claims.

Having thus fully described my invention what l claim and desire tosecure by Let-- tersPatent iszl. A' main valve comprising a casing, avalve formed by a tube carrying two paci;-

. ings, a motor piston carrying a packing of the same diameter as thevalve packings, and a fixed piston itted inside of the valve tube', theparts being arranged so that the valve casing can have thesainediameter= throughout.

2. A main valve comprising a easing, a valve tube, two packings i ttedthereon and separated by a bushing, said packing met trolling; ato-and-fro passage, a motor piston separated from, the valve tube by ahollow reduced bushing, a fixed piston fitting inside of the valve tube,and openings through the reduced bushing and valve tube to admitpressure between the valve tube and the fixed piston, the packingscontrolling the mand-fro passage and the motor piston being of the samediameter whereby the valve casing can be bored one diameter.

3. in automatic stop valve comprising a valve casing, a to-andfropassage and a to-,and-'ro pipe offset from each other connectedtherewith, a lining fitted in said casing and having ports opposite saidpassage and said pipe, a valve comprising two paolo ings mounted on ahollow stein or tube having inlets at its ends, a check valve or valvescontrolling ports or openings in said tube, valve stems connected tosaid tube and eittending out through stung boxes en both ends oi thevalve casing to balance the Valve hydraulically, and operating meansconnected to one oi, said valve stems.

lin testimony whereof l have hereunto set :my hand, in the presence oftwo subscribing Witnesses. .4

THURE LARSSN, y

ilitnesses .z

tl. M. ALLEN,

. Eoimss'r Wessels.

